/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.actionbarsherlock.sample.demos.app;

import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.ListFragment;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.support.v4.view.Menu;
import android.support.v4.widget.SimpleCursorAdapter;

import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract.Contacts;
import android.text.TextUtils;
import android.util.Log;
import android.view.MenuInflater;
import android.view.View;
import android.widget.ListView;

/**
 * Demonstration of the use of a CursorLoader to load and display contacts data
 * in a fragment.
 */
public class LoaderCursorSupport extends FragmentActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		FragmentManager fm = getSupportFragmentManager();

		// Create the list fragment and add it as our sole content.
		if (fm.findFragmentById(android.R.id.content) == null) {
			CursorLoaderListFragment list = new CursorLoaderListFragment();
			fm.beginTransaction().add(android.R.id.content, list).commit();
		}
	}

	public static class CursorLoaderListFragment extends ListFragment implements LoaderManager.LoaderCallbacks<Cursor> {

		// This is the Adapter being used to display the list's data.
		SimpleCursorAdapter mAdapter;

		// If non-null, this is the current filter the user has provided.
		String mCurFilter;

		@Override
		public void onActivityCreated(Bundle savedInstanceState) {
			super.onActivityCreated(savedInstanceState);

			// Give some text to display if there is no data. In a real
			// application this would come from a resource.
			setEmptyText("No phone numbers");

			// We have a menu item to show in action bar.
			setHasOptionsMenu(true);

			// Create an empty adapter we will use to display the loaded data.
			mAdapter = new SimpleCursorAdapter(getActivity(), android.R.layout.simple_list_item_2, null, new String[] { Contacts.DISPLAY_NAME,
					Contacts.CONTACT_STATUS }, new int[] { android.R.id.text1, android.R.id.text2 }, 0);
			setListAdapter(mAdapter);

			// Start out with a progress indicator.
			setListShown(false);

			// Prepare the loader. Either re-connect with an existing one,
			// or start a new one.
			getLoaderManager().initLoader(0, null, this);
		}

		@Override
		public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
			// Place an action bar item for searching.
			// MenuItem item = menu.add("Search");
			// item.setIcon(android.R.drawable.ic_menu_search);
			// item.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
			// SearchView sv = new SearchView(getActivity());
			// sv.setOnQueryTextListener(this);
			// item.setActionView(sv);
		}

		public boolean onQueryTextChange(String newText) {
			// Called when the action bar search text has changed. Update
			// the search filter, and restart the loader to do a new query
			// with this filter.
			mCurFilter = !TextUtils.isEmpty(newText) ? newText : null;
			getLoaderManager().restartLoader(0, null, this);
			return true;
		}

		@Override
		public void onListItemClick(ListView l, View v, int position, long id) {
			// Insert desired behavior here.
			Log.i("FragmentComplexList", "Item clicked: " + id);
		}

		// These are the Contacts rows that we will retrieve.
		static final String[] CONTACTS_SUMMARY_PROJECTION = new String[] { Contacts._ID, Contacts.DISPLAY_NAME, Contacts.CONTACT_STATUS,
				Contacts.CONTACT_PRESENCE, Contacts.PHOTO_ID, Contacts.LOOKUP_KEY, };

		public Loader<Cursor> onCreateLoader(int id, Bundle args) {
			// This is called when a new Loader needs to be created. This
			// sample only has one Loader, so we don't care about the ID.
			// First, pick the base URI to use depending on whether we are
			// currently filtering.
			Uri baseUri;
			if (mCurFilter != null) {
				baseUri = Uri.withAppendedPath(Contacts.CONTENT_FILTER_URI, Uri.encode(mCurFilter));
			} else {
				baseUri = Contacts.CONTENT_URI;
			}

			// Now create and return a CursorLoader that will take care of
			// creating a Cursor for the data being displayed.
			String select = "((" + Contacts.DISPLAY_NAME + " NOTNULL) AND (" + Contacts.HAS_PHONE_NUMBER + "=1) AND (" + Contacts.DISPLAY_NAME + " != '' ))";
			return new CursorLoader(getActivity(), baseUri, CONTACTS_SUMMARY_PROJECTION, select, null, Contacts.DISPLAY_NAME + " COLLATE LOCALIZED ASC");
		}

		public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
			// Swap the new cursor in. (The framework will take care of closing
			// the
			// old cursor once we return.)
			mAdapter.swapCursor(data);

			// The list should now be shown.
			if (isResumed()) {
				setListShown(true);
			} else {
				setListShownNoAnimation(true);
			}
		}

		public void onLoaderReset(Loader<Cursor> loader) {
			// This is called when the last Cursor provided to onLoadFinished()
			// above is about to be closed. We need to make sure we are no
			// longer using it.
			mAdapter.swapCursor(null);
		}
	}

}
